Mass. Gen. Laws ch. 149 § 23
No person, during the continuance of a strike, lockout or other labor trouble among his employees or those of another person, shall directly or indirectly procure or attempt to procure, or assist in any way in procuring or attempting to procure, persons to fill the places of employees involved in such strike, lockout or other labor trouble, if such persons are or have been solicited by means of advertisements or oral or written statements in which it has not been plainly and explicitly mentioned that a strike, lockout or other labor trouble exists in the establishment where such persons are to be employed. This provision shall apply whether such advertisements or oral or written solicitations were made within or without the commonwealth. In printed advertisements or in signs or posters, the mention of the strike, lockout or other labor trouble shall be in letters as large as the largest letters used in the body of said advertisement, sign or poster.
Any person violating any provision of this or the preceding section shall be punished by a fine of not more than two thousand dollars.
Mass. Gen. Laws ch. 149, § 23